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Bhargava Abhyankar Bhargava.Abhyankar at radisys.comHello Jacob, Thanks for your inputs. >what exactly is your definition of 'rach_type'? Could you please either add a reference to the document where this notion is >specified, or if there is none, a specification of its value range. We propose to use following enum as 'rach_type' enum { GPRS_8_BIT_RACH = 0, GPRS_11_BIT_RACH , EGPRS_8_PSK_11_BIT_RACH , EGPRS_NO_8_PSK_11_BIT_RACH }; This is not specified in standard, this is introduced as part of proposed interface changes between osmo-bts and osmo-pcu. Osmo-bts should get the RACH information from L1 APIs and fill the appropriate 'rach_type' and send to osmo-pcu. Osmo-bts can distinguish between 8 bit RACH and 11 bit RACH using 'u8Size' parameter in PH-RA-IND premetive. There is still open point on how osmo-bts distinguishes between types of 11 bit RACH based on received layer 1 message. Let me know if you have any inputs. Thanks Bhargava Abhyankar